360 lines
9.8 KiB
C
360 lines
9.8 KiB
C
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/* Remote target communications for the Macraigor Systems BDM Wiggler
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talking to a Motorola PPC 8xx ADS board
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Copyright 1996, 1997 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "gdbcore.h"
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#include "gdb_string.h"
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#include <fcntl.h>
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#include "frame.h"
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#include "inferior.h"
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#include "bfd.h"
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#include "symfile.h"
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#include "target.h"
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#include "wait.h"
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#include "gdbcmd.h"
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#include "objfiles.h"
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#include "gdb-stabs.h"
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#include <sys/types.h>
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#include <signal.h>
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#include "serial.h"
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#include "ocd.h"
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static void bdm_ppc_open PARAMS ((char *name, int from_tty));
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static int bdm_ppc_wait PARAMS ((int pid,
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struct target_waitstatus *target_status));
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static void bdm_ppc_fetch_registers PARAMS ((int regno));
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static void bdm_ppc_store_registers PARAMS ((int regno));
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extern struct target_ops bdm_ppc_ops; /* Forward decl */
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/*#define BDM_NUM_REGS 71*/
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#define BDM_NUM_REGS 24
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#define BDM_REGMAP \
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2048, 2049, 2050, 2051, 2052, 2053, 2054, 2055, /* r0-r7 */ \
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2056, 2057, 2058, 2059, 2060, 2061, 2062, 2063, /* r8-r15 */ \
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2064, 2065, 2066, 2067, 2068, 2069, 2070, 2071, /* r16-r23 */ \
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2072, 2073, 2074, 2075, 2076, 2077, 2078, 2079, /* r24-r31 */ \
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\
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2080, 2082, 2084, 2086, 2088, 2090, 2092, 2094, /* fp0->fp8 */ \
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2096, 2098, 2100, 2102, 2104, 2106, 2108, 2110, /* fp0->fp8 */ \
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2112, 2114, 2116, 2118, 2120, 2122, 2124, 2126, /* fp0->fp8 */ \
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2128, 2130, 2132, 2134, 2136, 2138, 2140, 2142, /* fp0->fp8 */ \
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\
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26, /* pc (SRR0 (SPR 26)) */ \
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2146, /* ps (MSR) */ \
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2144, /* cnd (CR) */ \
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8, /* lr (SPR 8) */ \
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9, /* cnt (CTR (SPR 9)) */ \
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1, /* xer (SPR 1) */ \
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0, /* mq (SPR 0) */
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char nowatchdog[4] = {0xff,0xff,0xff,0x88};
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/* Open a connection to a remote debugger.
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NAME is the filename used for communication. */
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static void
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bdm_ppc_open (name, from_tty)
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char *name;
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int from_tty;
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{
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CORE_ADDR watchdogaddr = 0xff000004;
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ocd_open (name, from_tty, OCD_TARGET_MOTO_PPC, &bdm_ppc_ops);
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/* We want interrupts to drop us into debugging mode. */
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/* Modify the DER register to accomplish this. */
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ocd_write_bdm_register (149, 0x20024000);
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/* Disable watchdog timer on the board */
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ocd_write_bytes (watchdogaddr, nowatchdog, 4);
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}
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/* Wait until the remote machine stops, then return,
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storing status in STATUS just as `wait' would.
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Returns "pid" (though it's not clear what, if anything, that
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means in the case of this target). */
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static int
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bdm_ppc_wait (pid, target_status)
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int pid;
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struct target_waitstatus *target_status;
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{
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int stop_reason;
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target_status->kind = TARGET_WAITKIND_STOPPED;
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stop_reason = ocd_wait ();
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if (stop_reason)
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{
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target_status->value.sig = TARGET_SIGNAL_INT;
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return inferior_pid;
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}
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target_status->value.sig = TARGET_SIGNAL_TRAP; /* XXX for now */
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#if 0
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{
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unsigned long ecr, der;
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ecr = ocd_read_bdm_register (148); /* Read the exception cause register */
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der = ocd_read_bdm_register (149); /* Read the debug enables register */
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fprintf_unfiltered (gdb_stdout, "ecr = 0x%x, der = 0x%x\n", ecr, der);
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}
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#endif
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return inferior_pid;
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}
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static int bdm_regmap[] = {BDM_REGMAP};
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/* Read the remote registers into regs.
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Fetch register REGNO, or all registers if REGNO == -1
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The Wiggler uses the following codes to access the registers:
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0 -> 1023 SPR 0 -> 1023
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0 - SPR 0 - MQ
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1 - SPR 1 - XER
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8 - SPR 8 - LR
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9 - SPR 9 - CTR (known as cnt in GDB)
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26 - SPR 26 - SRR0 - pc
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1024 -> 2047 DCR 0 -> DCR 1023 (IBM PPC 4xx only)
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2048 -> 2079 R0 -> R31
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2080 -> 2143 FP0 -> FP31 (64 bit regs) (IBM PPC 5xx only)
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2144 CR (known as cnd in GDB)
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2145 FPCSR
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2146 MSR (known as ps in GDB)
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*/
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static void
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bdm_ppc_fetch_registers (regno)
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int regno;
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{
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int i;
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unsigned char *regs, *beginregs, *endregs, *almostregs;
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unsigned char midregs[32];
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unsigned char mqreg[1];
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int first_regno, last_regno;
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int first_bdm_regno, last_bdm_regno;
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int reglen, beginreglen, endreglen;
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#if 1
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for (i = 0; i < (FPLAST_REGNUM - FP0_REGNUM + 1); i++)
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{
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midregs[i] = -1;
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}
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mqreg[0] = -1;
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#endif
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if (regno == -1)
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{
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first_regno = 0;
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last_regno = NUM_REGS - 1;
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first_bdm_regno = 0;
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last_bdm_regno = BDM_NUM_REGS - 1;
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}
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else
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{
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first_regno = regno;
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last_regno = regno;
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first_bdm_regno = bdm_regmap [regno];
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last_bdm_regno = bdm_regmap [regno];
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}
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if (first_bdm_regno == -1)
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{
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supply_register (first_regno, NULL);
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return; /* Unsupported register */
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}
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#if 1
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/* Can't ask for floating point regs on ppc 8xx, also need to
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avoid asking for the mq register. */
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if (first_regno == last_regno) /* only want one reg */
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{
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/* printf("Asking for register %d\n", first_regno); */
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/* if asking for an invalid register */
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if ((first_regno == MQ_REGNUM) ||
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((first_regno >= FP0_REGNUM) && (first_regno <= FPLAST_REGNUM)))
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{
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/* printf("invalid reg request!\n"); */
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supply_register (first_regno, NULL);
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return; /* Unsupported register */
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}
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else
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{
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regs = ocd_read_bdm_registers (first_bdm_regno,
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last_bdm_regno, ®len);
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}
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}
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else /* want all regs */
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{
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/* printf("Asking for registers %d to %d\n", first_regno, last_regno); */
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beginregs = ocd_read_bdm_registers (first_bdm_regno,
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FP0_REGNUM - 1, &beginreglen);
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endregs = (strcat (midregs,
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ocd_read_bdm_registers (FPLAST_REGNUM + 1,
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last_bdm_regno - 1, &endreglen)));
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almostregs = (strcat (beginregs, endregs));
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regs = (strcat (almostregs, mqreg));
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reglen = beginreglen + 32 + endreglen + 1;
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}
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#endif
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#if 0
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regs = ocd_read_bdm_registers (first_bdm_regno, last_bdm_regno, ®len);
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#endif
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for (i = first_regno; i <= last_regno; i++)
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{
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int bdm_regno, regoffset;
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bdm_regno = bdm_regmap [i];
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if (bdm_regno != -1)
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{
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regoffset = bdm_regno - first_bdm_regno;
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if (regoffset >= reglen / 4)
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continue;
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supply_register (i, regs + 4 * regoffset);
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}
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else
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supply_register (i, NULL); /* Unsupported register */
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}
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}
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/* Store register REGNO, or all registers if REGNO == -1, from the contents
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of REGISTERS. FIXME: ignores errors. */
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static void
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bdm_ppc_store_registers (regno)
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int regno;
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{
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int i;
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int first_regno, last_regno;
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int first_bdm_regno, last_bdm_regno;
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if (regno == -1)
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{
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first_regno = 0;
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last_regno = NUM_REGS - 1;
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first_bdm_regno = 0;
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last_bdm_regno = BDM_NUM_REGS - 1;
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}
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else
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{
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first_regno = regno;
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last_regno = regno;
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first_bdm_regno = bdm_regmap [regno];
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last_bdm_regno = bdm_regmap [regno];
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}
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if (first_bdm_regno == -1)
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return; /* Unsupported register */
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for (i = first_regno; i <= last_regno; i++)
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{
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int bdm_regno;
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bdm_regno = bdm_regmap [i];
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/* only attempt to write if it's a valid ppc 8xx register */
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/* (need to avoid FP regs and MQ reg) */
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if ((i != MQ_REGNUM) && ((i < FP0_REGNUM) || (i > FPLAST_REGNUM)))
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{
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/* printf("write valid reg %d\n", bdm_regno); */
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ocd_write_bdm_registers (bdm_regno, registers + REGISTER_BYTE (i), 4);
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}
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/*
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else if (i == MQ_REGNUM)
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printf("don't write invalid reg %d (MQ_REGNUM)\n", bdm_regno);
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else
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printf("don't write invalid reg %d\n", bdm_regno);
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*/
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}
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}
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/* Define the target subroutine names */
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struct target_ops bdm_ppc_ops = {
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"ocd", /* to_shortname */
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"Remote target with On-Chip Debugging", /* to_longname */
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"Use a remote target with On-Chip Debugging. To use a target box,\n\
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specify the serial device it is connected to (e.g. /dev/ttya). To use\n\
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a wiggler, specify wiggler and then the port it is connected to\n\
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(e.g. wiggler lpt1).", /* to_doc */
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bdm_ppc_open, /* to_open */
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ocd_close, /* to_close */
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NULL, /* to_attach */
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ocd_detach, /* to_detach */
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ocd_resume, /* to_resume */
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bdm_ppc_wait, /* to_wait */
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bdm_ppc_fetch_registers, /* to_fetch_registers */
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bdm_ppc_store_registers, /* to_store_registers */
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ocd_prepare_to_store, /* to_prepare_to_store */
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ocd_xfer_memory, /* to_xfer_memory */
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ocd_files_info, /* to_files_info */
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ocd_insert_breakpoint, /* to_insert_breakpoint */
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ocd_remove_breakpoint, /* to_remove_breakpoint */
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NULL, /* to_terminal_init */
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NULL, /* to_terminal_inferior */
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NULL, /* to_terminal_ours_for_output */
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NULL, /* to_terminal_ours */
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NULL, /* to_terminal_info */
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ocd_kill, /* to_kill */
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ocd_load, /* to_load */
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NULL, /* to_lookup_symbol */
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ocd_create_inferior, /* to_create_inferior */
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ocd_mourn, /* to_mourn_inferior */
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0, /* to_can_run */
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0, /* to_notice_signals */
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ocd_thread_alive, /* to_thread_alive */
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ocd_stop, /* to_stop */
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process_stratum, /* to_stratum */
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NULL, /* to_next */
|
|||
|
|
1, /* to_has_all_memory */
|
|||
|
|
1, /* to_has_memory */
|
|||
|
|
1, /* to_has_stack */
|
|||
|
|
1, /* to_has_registers */
|
|||
|
|
1, /* to_has_execution */
|
|||
|
|
NULL, /* sections */
|
|||
|
|
NULL, /* sections_end */
|
|||
|
|
OPS_MAGIC /* to_magic */
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
void
|
|||
|
|
_initialize_bdm_ppc ()
|
|||
|
|
{
|
|||
|
|
add_target (&bdm_ppc_ops);
|
|||
|
|
}
|